作者:F.J. Lopez Herrera、M.S. Pino Gonzalez
DOI:10.1016/s0040-4020(01)96089-2
日期:1986.1
aldehyde sugars 1, (free or in lactol form), reacted with methyl hydrogen malonate to give α,β-unsaturated esters 2. In the case of lactols, the R group in 2 is not identical to the R in 1 (epimerisation occurs). Base-catalysed addition of methanol to the esters 2, afforded the epimeric ethers 3, acid hydrolisis of which yielded the 2-deoxy-3-0-methyl-1,4-aldonolactones 4. Degradation of the sugar chain
到2-脱氧- 3-甲实用合成路线0 -甲基-1,4- aldonolactones得以实现。醛糖1的异亚丙基衍生物(游离或以乳糖醇的形式)与丙二酸氢甲酯反应生成α,β-不饱和酯2。在乳糖醇的情况下,2中的R基团与1中的R基团不相同(发生差向异构化)。将甲醇碱催化加成到酯2中,得到差向异构醚3,其酸水解产生2-脱氧-3- 0-甲基-1,4-醛内酯4。 C-3上的绝对配置。